Castle climbing structure



FIG. 1 is a top left front perspective view of a castle climbing stucture showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof.

FIG. 6 is a top plan view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a castle climbing structure, as shown and described. 